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71.
Chih‐Chiao Huang Ming‐Syun Yang Mong Liang 《Journal of polymer science. Part A, Polymer chemistry》2006,44(20):5875-5886
A new class of thermosetting poly(2,6‐dimethyl‐1,4‐phenylene oxide)s containing pendant epoxide groups were synthesized and characterized. These new epoxy polymers were prepared through the bromination of poly(2,6‐dimethyl‐1,4‐phenylene oxide) in halogenated aromatic hydrocarbons followed by a Wittig reaction to yield vinyl‐substituted polymer derivatives. The treatment of the vinyl‐substituted polymers with m‐chloroperbenzoic acid led to the formation of epoxidized poly(2,6‐dimethyl‐1,4‐phenylene oxide) with variable pendant ratios, and the structures and properties were studied with nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, and gel permeation chromatography. The ratios of pendant functional groups were tailored for the polymer properties, and the results showed that the glass‐transition temperatures increased as the benzylic protons were replaced by bromo‐, vinyl‐, or epoxide‐functional groups, whereas the thermal stability decreased in comparison with the original polymer. Within a molar fraction of 20–50%, the degree of functionalization had little effect on the glass‐transition temperature; however, it correlated inversely with the thermal stability of each functionalized polymer. The thermal curing behavior of the epoxide‐functionalized polymer was enhanced by the increment of the pendant functionality, which resulted in a significant increase in the glass‐transition temperature as well as the thermal stability after the curing reaction. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 5875–5886, 2006 相似文献
72.
Yabin Zhou Shifeng Wang Yinxi Zhang Yong Zhang 《Journal of Polymer Science.Polymer Physics》2006,44(8):1226-1236
Methacrylic acid (MAA) was used as in situ surface modifier to improve the interface interaction between nano‐CaCO3 particle and ethylene–propylene–diene monomer (EPDM) matrix, and hence the mechanical properties of nano‐CaCO3‐filled EPDM vulcanizates. The results showed that the incorporation of MAA improved the filler–matrix interaction, which was proved by Fourier transformation infrared spectrometer (FTIR), Kraus equation, crosslink density determination, and scanning electron microscope (SEM). The formation of carboxylate and the participation of MAA in the crosslinking of EPDM indicated the strong filler–matrix interaction from the aspect of chemical reaction. The results of Kraus equation showed that the presence of MAA enhanced the reinforcement extent of nano‐CaCO3 on EPDM vulcanizates. Crosslink density determination proved the formation of the ionic crosslinks in EPDM vulcanizates with the existence of MAA. The filler particles on tensile fracture were embedded in the matrix and could not be observed obviously, indicating that a strong interfacial interaction between the filler and the matrix had been achieved with the incorporation of MAA. Meanwhile, the presence of MAA remarkably increased the modulus and tensile strength of the vulcanizates, without negative effect on the high elongation at break. Furthermore, the ionic bond was thought to be formed only on filler surface because of the absolute deficiency of MAA, which resulted in the possible structure where filler particles were considered as crosslink points. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 1226–1236, 2006 相似文献
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郑洪 《浙江大学学报(理学版)》1996,23(4):342-347
本文介绍了一种钢卷尺刻度在线测量系统 ,它采用了高速摄像及计算机数据处理技术 ,文章阐述了系统的非接触动态测量原理 ,描述了光电信号的处理方法 . 相似文献
76.
《科学通报(英文版)》1995,40(18):1516-1516
77.
徐维鼎 《上海理工大学学报》1989,(1)
本文使用反馈控制和广义逆矩阵研究离散大系统的多级控制问题,即在局部控制器上加所谓“校正”控制器,达到中性关联作用,使整个系统的性能指标为极小,且得到较小的性能指标偏差的上界。 相似文献
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稀土复合变质对新型铸造热锻模具钢组织与性能的影响 总被引:8,自引:1,他引:8
研究了稀土复合变质对新型铸造热锻模具钢(CHD钢)组织与性能的组织。结果表明,稀土复合变质能细化晶粒,并且随着稀土量的增加。细化效果明显;加入适量的稀土复合变质后,夹杂物数量明显减少,夹杂物趋于球化并均匀地分布在钢中,形态和分布得以了改善,向钢中加入稀土进行复合变质,能促进贝氏体、奥氏体和位错亚结构的形成,细化马氏体板条。当残留稀土含量为0.02%时,CHD钢的硬度、强度变化不大,断裂韧性(KIC)和疲劳裂纹扩展门槛值(△Kth)有所提高,冲击韧性、延伸率、断面收缩率提高了近一倍,抗热疲劳性能也最好。 相似文献